616863817 has 2 divisors, whose sum is σ = 616863818. Its totient is φ = 616863816.

The previous prime is 616863773. The next prime is 616863829. The reversal of 616863817 is 718368616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 566963721 + 49900096 = 23811^2 + 7064^2 .

It is a cyclic number.

It is not a de Polignac number, because 616863817 - 2²⁷ = 482646089 is a prime.

It is not a weakly prime, because it can be changed into another prime (616863857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308431908 + 308431909.

It is an arithmetic number, because the mean of its divisors is an integer number (308431909).

Almost surely, 2^616863817 is an apocalyptic number.

It is an amenable number.

616863817 is a deficient number, since it is larger than the sum of its proper divisors (1).

616863817 is an equidigital number, since it uses as much as digits as its factorization.

616863817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 46.

The square root of 616863817 is about 24836.7432848995. The cubic root of 616863817 is about 851.2617096277.

The spelling of 616863817 in words is "six hundred sixteen million, eight hundred sixty-three thousand, eight hundred seventeen".